Mechanical davit.



Patented Feb. 25, 1919.

2 SHEETS-snaar.

T. H. MARTN.

MECHANICAL DAVIT.

APPLICATION FILED JULY 1. 1918,

Patented Feb. 25, 1919.

2 SHEETS-SHEEI 2.

THOMAS HENRY MARTEN, OF TORONTO, ONTARIO, CANADA.

MECHANICAL DAVIT.

Application led .Tuly 1, 1918.

l To all whom t may concern.'

Be it known that I, THOMAS HENRY MAR- TEN, a subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Mechanical Davits, as described in the following speciflcation and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the invention are, to enable boats being placed very closely together end to end upon ships having restricted deck space and to allow of davits being located at the eXtreme ends of limited deck spaces, the operating gear being so arranged as to be easily operated, and where boats are placed closely7 together end to end the operating gear will not interfere with the opera-tion of the adjacent davit.

The principal feature of the invention consists in the arrangement of the operating 'mechanism out of alinement with the plane of movement of the davit boom and in providing an operating mechanism whichwill operate effectively under constantly changing angular positions.

In the drawings, Figure .1 is an elevational view taken athwart ship showing a side elevation of the davit in the inboard position in full lines and in the outboard position in dotted lines. v

Fig. 2 is a fore and aft elevational view of the davit.

Fig. 3 is a plan sectional view on the line 3 3 of Fig. 2 and illustrating the range of swing of the boom operating gear.

Referring to the drawings, the boom 1 v is formed with a fore and aft sweep at the lower end 2 conforming in general curvature to the curvature of the end of the boat and is of a web structure, preferably of an H cross section and is provided with a jawshaped lower extremity 3.

The base 4 is secured upon a wooden sole piece 5 and is provided with upwardly projecting standards 6 in which is journaled a pivot pin 7 extending through and secured in the jaw end 3 of the boom, thus pivotally supporting the boom at its lower end. The base 4 is preferably provided with a pair of inwardly eXtendingbrackets 8 which are bolted through the sole piece to the deck.

A deck stool 9 is rigidl secured to the deck and the outboard'enc thereof is connected by the bolt 10 to the base 4. The

Specification of Letters Patent.

Patented Feb. 25, 1919.

Serial No. 242,770.

inboard end of the stool is provided with a pair of horizontally arranged lugs 11 in which a vertically disposed pin 12 is pivotally supported. The upper end of the pin 12 is provided with ahead 13 bearing upon the upper lug and the head is formed with a bifurcated extension 14.

An operating gear is supported at one end from the head 13 which gear is shown and described in detail in Vmy former application No. 222,710 and consists of a telescopic member 14, the inner and rod end of which is pivotally secured to the upper end of the bifurcated head 13 and the operating screw is carried in the pivotally supported thrust bearing v16 and engages the floating nut 17 which is arranged between the downwardly extending lugs 18 of the collar 19 connected to the outer tubular member 20 of the telescopic member.

The inboard end of the operating gear is universally supported to swing up or down upon the swivel head 13 and the swivel head allows it to swing transversely.

Upon the outer end of the tubular member 20 is secured a jaw-shaped member 21 carrying a cross pin 22 upon which is pivotally supported a jaw member 23 which is adapted to straddle the boom 1 and which is pivotally connected to the boom by the pin 24.V A universal connection is thus provided at the outer end of the operating gear which allows of the free swinging of the boom upon its pivot pin. The cross pin connection 22 in the jaw 21 allows the operating gear to swing upon the pivotal support of the head 13.

The base of the davit is arranged close in under the bow end of the boat as illustrated in the drawings so that the boom merely clears the end and as the lower end of the boom is curved to correspond with the contour of the bow end of the boat, the outer edge of the base may be located practically in alinement with the eXtreme ends of the boat. The deck stool is therefore located out of alinement of the planeV of the swing of the boom, consequently the operating gear is arranged at an angle to the plane of operation of the boom and as the boom swings upon its pivot, the angular position constantly changes. The universal connection of the operating gear to the boom and the universal support of the operating gear from the stool allows of this angular connection and the angular arrangement of the operating gear throws the operating handle well in toward the boat so that it can be operated quite freely and without interference with the operating gear of anradjacent davit and also in cases where the edge of the base is secured to the end limitation of deck space the angular inward location of the operating handle allows the boat crew to operate the same from the deck space.

This construction allows of the use of mechanical davits where otherwise it would be impossible to operate and where a deck space is such that it would accommodate the length-of two boats but would not allow of the ordinary space for davits. These davts can be placed so close together that as long as the booms will operate to pass eachother, theoperating gear can loe set at an'angle suflicient toallow of the operation of 'the gear of each davit7 without interfering with the other. Y

What I claim as my invention is:

l. In a mechanical davit, the combination ported from said inboard extension out of alinement with the plane oit' movement of the boom and universally connected to the boom intermediate of its length.

3. A mechanical davit, comprising'7 a lease7 a boom pivoted on said base and oii'set to oneV side, a deck stool connected to said base, a pivot head vertically mounted in said vstool and arranged out of alinementV with the plane of movement of the boom, a telescopic boom operating gear universally connected to the boom and universally connected to the pivot head.

THOMAS HENRY MARTEN.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner of atents,

Y Washington, D; G. f 

